Very great answers, thanks. Didnīt know it was rather easy to remove DRM. I'll make my research!
Personally, I am not confortable with software and devices that only work with a particular vendor. That's why I do believe, for eg, that the Ipod is a great product with great user experience but never purchased one , don't like the idea of syncronize with only one computer. That's why also I am not convinced with Kindle.
Probably the one exception is Windows.